Feasibility of Controlling NO<sub>x</sub>Emissions from a Jet Flame by Acoustic Excitation

Chao, Yei-Chin; Huang, Yau-Wei; Wu, Der-Chyun

doi:10.1080/00102200008947345

Cited by 7 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the natural flame, the blowoff limit is insensitive to Re, and it ranges from m = 1.5 to 2. On the other hand, in the controlled flames, it is significantly extended to larger m for Re > Many researchers have reported that a lifted flame is stabilized through excitation with piezoelectric actuators (Chao et al (22) ) or acoustic speaker (Chao et al (28) ; Baillot & Demare (29) ). They controlled lifted flames in the hysteresis region, where the exit flow velocity is so small that the natural flame base is held upstream of the jet potential core.…”

Section: Control Of Coaxial Jet Flow and Combustionmentioning

confidence: 99%

See 1 more Smart Citation

Toward Smart Control of Turbulent Jet Mixing and Combustion

Kasagi

2006

JSME international journal. Ser. B, Fluids and thermal engineer

View full text Add to dashboard Cite

Recent progress in active control of jet mixing and combustion is introduced. Miniature electromagnetic flap actuators are mounted on the periphery of an axisymmetric nozzle exit. It is demonstrated that even weak disturbances introduced into the initial shear layer by these actuators can significantly modify the large-scale vortical structures. This control technique is extended to the control of methane/air mixing and diffusion combustion by using a coaxial jet nozzle with the same flap actuators. As a result, the flame characteristics can be much improved in terms of stability and emission. Direct numerical simulation of a confined coaxial jet control has also been carried out. Although the distributed actuators are modeled somewhat ideally, DNS clearly demonstrates enormous effects of the present control scheme on the initial shear layer dynamics and concentration mixing.

show abstract

Section: Control Of Coaxial Jet Flow and Combustionmentioning

confidence: 99%

“…Chao et al (22) examined NOx and unburnt hydrocarbons (UHC) emissions in the propane/air lifted flame excited with an acoustic speaker. They reported that mixing between the premixture and ambient air is enhanced upstream of the flame base, so that NOx emission is reduced without significant increase of UHC.…”

Section: Introductionmentioning

confidence: 99%

Toward Smart Control of Turbulent Jet Mixing and Combustion

Kasagi

2006

JSME international journal. Ser. B, Fluids and thermal engineer

View full text Add to dashboard Cite

show abstract

“…Lean premixed flames are more sensitive to flow perturbations and tend to induce self-excited thermoacoustic oscillations. However, in terms of NOx reduction, the effects of acoustic excitation on partially premixed flame and diffusion flame could potentially be more effective [18][19][20][21], as the lean premixed flame inherently has very low NOx emissions. Partially premixed flames have dual flame dynamics characteristic of lean premixed flame and diffusion flame.…”

mentioning

confidence: 99%

Effect of Different Acoustic Parameters on NOx Emissions of Partially Premixed Flame

et al. 2019

View full text Add to dashboard Cite

The effects of acoustic frequency (f)/0–400 Hz and amplitude (A)/0–1400 Pa on nitrogen oxides (NOx) emissions of a partially premixed flame were investigated experimentally. The mechanism of NOx emissions was analyzed by the evolution of the vortex, which was shown by particle image velocimetry (PIV). From the relationship of NOx emission index (EINOx) and acoustic parameters, it was concluded that a critical frequency (fc) from 170 Hz to 190 Hz appeared. When the frequency was less than fc, EINOx decreased linearly with an increase in amplitude. The flame length became shorter, which led to a decrease in the global residence time, and hence, a reduction in reaction time for NOx. However, a direct proportional relationship between EINOx and amplitude was not found when the frequency was larger than fc. Based on PIV particle scattering images, with an increase of the acoustic frequency, the effects of the acoustic field on the flame base became less significant, but the flame length and reaction space of NOx were gradually increased.

show abstract

Thermal and NOx emission characteristics of periodic fuel-flow-pulsed combustion at a nozzle-mixed burner in a direct-fired furnace

Lee,

Seo

2025

Applied Thermal Engineering

View full text Add to dashboard Cite

Feasibility of Controlling NO_xEmissions from a Jet Flame by Acoustic Excitation

Cited by 7 publications

References 21 publications

Toward Smart Control of Turbulent Jet Mixing and Combustion

Toward Smart Control of Turbulent Jet Mixing and Combustion

Effect of Different Acoustic Parameters on NOx Emissions of Partially Premixed Flame

Thermal and NOx emission characteristics of periodic fuel-flow-pulsed combustion at a nozzle-mixed burner in a direct-fired furnace

Contact Info

Product

Resources

About

Feasibility of Controlling NOxEmissions from a Jet Flame by Acoustic Excitation

Cited by 7 publications

References 21 publications

Toward Smart Control of Turbulent Jet Mixing and Combustion

Toward Smart Control of Turbulent Jet Mixing and Combustion

Effect of Different Acoustic Parameters on NOx Emissions of Partially Premixed Flame

Thermal and NOx emission characteristics of periodic fuel-flow-pulsed combustion at a nozzle-mixed burner in a direct-fired furnace

Contact Info

Product

Resources

About

Feasibility of Controlling NO_xEmissions from a Jet Flame by Acoustic Excitation